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driver: tun: Move tun check into the block of TUNSETIFF condition check

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When cmd is TUNSETIFF and tun is not null, the original codes go ahead,
then reach the default case of switch(cmd) and set the ret is -EINVAL.
It is not clear for readers.

Now move the tun check into the block of TUNSETIFF condition check, and
return -EEXIST instead of -EINVAL when the tfile already owns one tun.

Signed-off-by: Gao Feng <fgao@ikuai8.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao Feng 2016-10-25 22:26:09 +08:00 committed by David S. Miller
parent 93a205ee98
commit 0f16bc1355
1 changed files with 5 additions and 1 deletions
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6
drivers/net/tun.c
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@ -2005,7 +2005,11 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
rtnl_lock();
tun = __tun_get(tfile);
if (cmd == TUNSETIFF && !tun) {
if (cmd == TUNSETIFF) {
ret = -EEXIST;
if (tun)
goto unlock;
ifr.ifr_name[IFNAMSIZ-1] = '\0';
ret = tun_set_iff(sock_net(&tfile->sk), file, &ifr);